Circuit
Voltage
24 DC
48 DC
125 DC
250 DC
600 DC
115AC
230 AC
460 AC
600 AC
CONSTRUCTION
GEH-2038
TABLE I
INTERRUPTING RATINGS
Non-Inductive Circuit
Inductive Circuit
Number of Contacts
1
2(in ser)
1
2(in ser)
10.0
8.0
5.0
1.0
0.4
40.0
25.0
12.0
10.0
30.0
25.0
15.0
3.0
0.8
75.0
50.0
25.0
20.0
8.0
6.0
4.0
1.0
0.3
24.0
12.0
5.0
8.0
25.0
18.0
10.0
2.5
0.7
50.0
25.0
15.0
12.0
The Type SBM switch is built up with a series of stages that are nested into
each other, an operating shaft, a front support and a rear support.
The complete stack is tied together with two tie bolts threaded into the front
support. These tie bolts also act as a bearing for the cam followers in each
stage.
Each stage consists of two cam follower assemblies made up of two
stationary contacts and one moving contact, (double break construction) one
cam and one cam follower. The cams are mounted on the operating shaft.
When
only one contact is required in a stage, one of the cam follower assemblies is
omitted.
CONTACT IDENTIFICATION
The contacts are marked for identification, using a standard system. On each
side of the switch, midway on the barriers, is a confined marking strip (See
Figure 4).
These strips are located between the two terminal screws which
define a contact.
The marking strip on the right side, front view, looking
toward the rear, is numbered 1, 3, 5, etc., starting at the panel end. Those
on the left side are marked 2, 4, 6, etc.
If a contact is omitted, the
terminal screws are also omitted for that contact.
ENCLOSURES AND MOUNTING
The basic switch is totally enclosed except for an opening in the bottom to
allow for a visual inspection of the contacts. (See Figure 3)
All switches are furnished for mounting in panels 3/32 to 1/4 inch thick.
Variation in panel thickness is taken up by the use of two saddle washers
mounted between the handl� and escutcheon.
INSTALLATION
RECEIVING
Immediately upon receipt of a switch, examine it for any damage sustained in
transit. If injury or rough handling is evident, file a damage claim at once
4
www
. ElectricalPartManuals
. com
